Schlossherr, J., Eggert, H., Paro, R., Cremer, S., Jack, R.S. (1994). Gene inactivation in Drosophila mediated by the Polycomb gene product or by position-effect variegation does not involve major changes in the accessibility of the chromatin fibre.
Mol. Gen. Genet. 243(4): 453--462.